Blizzard's audio team went full blockbuster with Battle for Azeroth and the zone themes alone carry entire moods. The WoW BfA soundtrack splits between Kul Tiras and Zandalar and both sides sound completely distinct. "Waycrest's Curse" drips with this gothic horror atmosphere, all creaking strings and unsettling choir that makes Drustvar feel genuinely threatening.
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"Might of Zandalar" flips to massive Mesoamerican-inspired percussion and brass that just thunders. Then "Stormsong Valley" opens into something almost pastoral before the darker undertones creep in. "Freehold" is pure pirate swagger and honestly.
It never gets old. The contrast between Kul Tiran folk and Zandalari grandeur gives this expansion some of the strongest musical identity in the whole WoW catalog. Perfect background for anyone grinding world quests at 3AM.